Grand Seiko Heritage Spring Drive SBGA439G 40.0 mm Steel Midnight Blue Dial Watch for Men

An archetypal Grand Seiko design with a midnight blue dial. Like a moonlit sky, the colour shifts with the light: at times the warmth of the blue comes forward, at others the dial looks almost black. Against it, the diamond-cut hands and hour markers stand out in sharp relief.

Powered by the Spring Drive calibre 9R65, the seconds hand glides silently and continuously, with no tick. The watch runs for about 72 hours when fully wound, shown on a discreet indicator next to the eight o'clock index. The 40.0 mm stainless steel case has a dual-curved sapphire crystal, a screw case back and a screw-down crown, and is water resistant to 10 bar.

Technical specifications

• Brand: Grand Seiko
• Collection: Heritage Collection
• Reference: SBGA439G
• Case: Stainless steel, 40.0 mm diameter, 46.6 mm lug-to-lug, 12.3 mm thick
• Crystal: Dual-curved sapphire crystal with anti-reflective coating on the inner surface
• Caseback: Screw case back
• Crown: Screw-down crown
• Water resistance: 10 bar (100 m)
• Dial: Midnight blue with diamond-cut hands and indices
• Functions: Hours, minutes, seconds, date, power reserve indicator
• Movement: Grand Seiko Spring Drive calibre 9R65, self-winding with manual winding
• Power reserve: Approx. 72 hours (3 days)
• Accuracy: ±15 seconds per month (±1 second per day)
• Jewels: 30
• Magnetic resistance: 4,800 A/m
• Bracelet: Stainless steel, 20 mm band width, 203 mm maximum perimeter
• Clasp: Folding clasp with push-button release
• Warranty: 5-year Grand Seiko worldwide warranty (Kamal Watch Co. is an authorised Grand Seiko Mastershop)